Azo dye.



UNITED STATES PATENT OFFICE.

- HEINRICH JORDAN AND WILHELM NEELMEIER, OF LEVERKUSEN, NEAR COLOGNE,

GERMANY, AS SIGNORS TO FARBENFABRIKEN VORM. ERIEDR. BAYER & (30., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

I AZO DYE.

993,073, :Specification of Letters Patent.

No Drawing.

facture and production of new iindvaluzlble azo dyestuffs.

The process for their production consists To all whom it may concern:

Be it known that we, I'IEINRICH- JORDAN and WILHELM NEELMEILR, doctors of chilosophy, chemists, citizens of the nterin combining diazo compounds of nromzitic man Empire, residing at Leverkusen, near 21mins. such as anilin, anisidin, toluidin, Cologne, Germany, have invented a New xyhdinf cresidin, mninophenols, naphthyl- Dye, of which the following is a specifica- 21111113, naphthylanlin sulfonic acids, etc: tion. with aminobenzoylaminobenzoy12-amino The present invention relates to the manunaphthol-7-sulfonic acids HO;S NH-COCqHr-NH-C0-CH NH1 The new-dyes are after being dried andI'zotized on the fiber and combined with de pulverized in the shape of tlie'ir'alkalin salts velopers c. g. betanuphthol, shades fast to dork powders soluble in water. They yield washing being thus obtained. upon reduction \vith hydrosulfite an aro In order to illustrate-the new proccss'lnore inatic 2min and aminobenzoylami'nobenzoylfully the following example is given, the 2-amino-5-naphthol-6-amino-7-snl'fonie acid. partsbeing' by weight: 93 parts .of :luilin They produce on cotton orange-red to are diazotized and the diazo compound bluish-red shades oi. great purity and of eicis added too solution of 477- parts of the cellent fastness to light. They can be diaacid: no.s Nn-co- I v l q NIC0r 4 H containing .400 parts ofsodium carbonate. alkalin suits after being dried und pulver- The dye se ara'tes. It is after being dried ized dark powders'soluble lnwvnler; yielding and pulverized in the shape of its sodium .npon reduction with hydrosullite nu urosalt a dark powder soluble in water with an mntic umin and :uninobenzoylmninobenzoylorange coloration and soluble. in concen- 2--:uni110-5-n:11)hthol-(3-nmino-7-sul'fonicacid; tratd sulfuric acid with a red coloration. anddyeingeotton from orunge-red to bluish- Upon reduction with hydrosulfite it is split red shadeywhich can be diazotized on the up into g-nilin and meta-.aminbbenzoylu1etufiber and combined with beta-nnphtnol, subaminobenzoyl-Q-amino 5-naphthol-6-aminostuntiully as described. 7-sulfonic acid. It dyes cotton in orange '2. The herein described azo dye obtained shades, which after being diuzotized and de-- from diazobenzene and met-Munipobenzoyl- 'veloped with beta-naphthol turn more yelmetnnminobenzoyl-2- am'ino-5-nnphthol-7- 'lowish. sul'fonicucid,which is after being dried and We claim pulverized in the shape of its'sodium szilt a 1. 'ihe herein described azo dyes obtained dark powder soluble in water-with an orange from a diezo compound and i'minobenzoylcoloration and soluble in concentrated sulvimiinobenzoyl-.Znmirrol-fi nuphthol-7 -sulfuric acid with a. red coloration; yielding upon reduction with hydrosulfite;metu-:nni-

f onic acid, which are in the shape oftheir nobenzoyl-meta-aminobenz0y1-2-amin0-5- set our hands in the presence of two subnaphthol-6-a1nin0-7-su1f0nic acid; and dyescribing witnesses. ing cotton orange shades which after being HEINRICH JORDAN. [L. s. diazotized and developed With beta-naphthol WILHELM NEELMEIER. [1,. s.]

5 are more yellowish, substantially as de- Witnesses:

scribed. CHAELJ. WRIGHT,

WALTER VONNEGU'I.

.In testimony, whereof We have hereunto 

